A model of site-specific nutrient management

A model is introduced to answer three questions pertaining to site-specific nutrient management in production of orchard crops: which input factors of crop production are limiting yield; what action should be taken to remove the limiting factors; and what is the potential gain in revenue from taking the action. Our model captures the essence of the law of the minimum in that yield and revenue increase only if the limiting nutrients are adjusted. An example of pear trees shows how to implement the method.